<div class="search-box">
    <form >
        <div class="input-group">
            <input type="text" id="keyword" name="keyword_" class="form-control" placeholder="Search" />
            <span class="input-group-btn">
                <button type="submit" class="btn btn-default"><span class="glyphicon glyphicon-search"></span>&nbsp;</button>
            </span>
        </div>
    </form>
</div>